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Charles Packer
Letta
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Charles Packer

Letta
@charlespacker
CEO at @Letta_AI, prev PhD at UC Berkeley (MemGPT, RL, agents)
SF
charlespacker.com
Joined March 2014
1,247
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  • Pinned
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    Charles Packer
    Letta
    @charlespacker
    Dec 11, 2025
    Continual learning in token space:
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    Continual Learning in Token Space
    From letta.com
  • user avatar
    Charles Packer
    Letta
    @charlespacker
    4h
    What is this aesthetic called Whatever it is, I like it 👍
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    00:39
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    John Sullivan Hamilton
    @hams
    6h
    Today we open sourced our no 1 used internal tool, berd. An agent where you can byo harness/models while keeping your work and context in one place, in an unhinged environment where you can build your dream team of agents. Try it out at berd.xyz!
  • user avatar
    Charles Packer
    Letta
    @charlespacker
    Aug 16
    "It took a long time for dynamic language REPLs to break out of the terminal (Jupyter notebooks and similar); I hope we don't have to wait as long for the harnesses." The harness has already escaped the terminal - it's what I call "harness-as-a-service", where you
    user avatar
    Patrick Collison
    Stripe
    @patrickc
    Aug 16
    I love agentic coding harnesses, but they shouldn't be primarily terminal-based. The terminal is great for quick and precise commands, but information density is extremely low and UI affordances are minimal. Maybe provision of TUIs is worthwhile for occasional use (when
  • user avatar
    Charles Packer
    Letta
    @charlespacker
    Aug 16
    cold harbor will be complete soon. please enjoy each memory equally.
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    Charles Packer
    Letta
    @charlespacker
    Aug 14
    "Ready for Cyber Defense" Incredible lead
    user avatar
    Z.ai
    @Zai_org
    Aug 14
    Introducing GLM-5.3: Built to Code. Ready for Cyber Defense. - Top-tier coding and agentic capabilities, achieved through post-training on the 743B base model - A major leap in cybersecurity, setting a new standard among open models Tech Blog: z.ai/blog/glm-5.3
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